ES2360139T3 - ELECTRONIC POWER CIRCUIT AS WELL AS ELECTRONIC POWER DEVICE WITH AN ELECTRONIC POWER CIRCUIT. - Google Patents

Abstract

Electronic power circuit that is arranged on a substrate and an electrical junction that admits a high current load, which is especially connected directly to the substrate at a connection point (4), where the junction (3) is configured as a junction flat band (3) and presents in the region of its free end a blade terminal joint element (15), characterized in that at least one support shoulder (17) is configured as support for a counter-bearing and a mutual assembly force is protected, during the attachment to a counter element (22), to avoid its application to the substrate.

Description

State of the art

The invention relates to an electronic power circuit that is arranged on a substrate and is connected, especially directly, to at least one electrical junction that admits a high current load.

It is known to join printed circuit boards to IMS (Insulated Metal Substrate) substrates through stamped grilles. If it is intended to connect to them, for example, an electric motor, which is fed from an electronic circuit on the printed circuit board / substrate, a large number of electrical interconnections are obtained: IMS / stamped grid, stamped grid / circuit board printed, printed circuit board, printed circuit board / plug, plug / cable, cable / motor, which leads to relatively high electrical losses.

US 6011319 describes the connection between a power electronics and a control electronics. This establishes the joint through a flat band joint in the form of a stamped piece of sheet metal configured in a smooth way. This is plugged with one end into the power electronics substrate and welded to it. The other end has a blade terminal joint element, through which a joint to a counterelement of the control electronics is then made through assembly. The end with the blade terminal connecting element also has a supporting shoulder. This is configured as a stop that determines the positioning of the flat band joint when inserting and welding it in the power electronics substrate. When assembling the counter element, assembly forces are applied to the substrate through the support shoulder.

Manifesto of the invention

Because of the configuration according to the invention, in which a joint is configured as a flat band joint which, in the region of its free end, has a blade terminal joint element and at least one support shoulder to absorb A mutual assembly force for binding to a counter element, a simple joining mode is created that supports a high current load. The high current junction leads from the substrate to which it is preferably attached directly, through the blade terminal joint element, to a counter element connected to the latter by mutual assembly force, where the described joint mode is configured as a flat-band joint, which is configured integrally, so that only one point of attachment is presented to the blade terminal joint element. In order to join the blade terminal joint element to a corresponding counter-element, it is necessary to apply a mutual assembly force, which is absorbed at least by a supporting shoulder, so that an inadmissible force is not applied for its mechanical attachment to the substrate . According to this, a very low impedance junction is presented, which also supports a high current load (for example for 50-150 amps) and can be handled easily and without problems.

According to an improvement of the invention, it is provided that the flat-band joint is provided with a metal strip, especially sheet metal stamping. A metal strip of this type admits a high current load and can be produced very easily in an integral way, especially as a stamped sheet metal part.

In addition to this it is advantageous to provide at least two mutually opposite support shoulders. The flat band joint is supported, during mutual assembly with the counter-element, on the two supporting shoulders, so that high mutual assembly forces can be applied without problems, without reaching unacceptable force applications.

Apart from this it is advantageous that the direct connection of the union to the substrate is configured as tin-plating, welding and / or riveting.

A refinement of the invention provides that the flat band joint can be deformed in the direction of its longitudinal extension by setting at least one flexion point. Consequently, a certain deformability is presented during mutual assembly with the counter element, so that tolerances can be compensated. The flexion point is preferably configured as a U-shaped soul. This means that the flat-band joint runs to the flexion point, there it is transformed from its longitudinal extension into the U-shape of the U-shaped soul and from there, to in turn, in the original longitudinal extension direction. The U-core essentially has a square cross-section, such that there is a good deformability that does not occur in relation to the cross-section of the flat band joint, otherwise mainly rectangular and especially elongated preferably .

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In addition to this, it is advantageous that the blade terminal connection element is configured as an insertion slit for a counter-element insertion core or as an insertion core for a counter-element insertion slot.

Apart from this the invention relates to an electronic power device with an electronic power circuit, especially as described above, wherein a flat-band counter-connection electrically connected to the flat-band joint is provided by mutual assembly. .

This flat counterband joint is preferably configured as a counter element and has the same.

In addition to this, it is provided that the flat counter-band joint is configured as a metal strip, especially stamped sheet metal. As a consequence of this, the basic flat-band and flat-band joint structure is very similar. Only the connecting elements are different, in order to assemble the pieces together. These connecting elements have to be configured correspondingly with respect to each other, in order to establish an electrically resistant joint by mutual assembly, especially mutual plug. Preferably, it is provided that this electrical connection is configured as an indissoluble connection after mutual assembly. The indissolubility is obtained that during the mutual assembly a deformation of corresponding material takes place.

According to an improvement of the invention it is provided that the electronic power device has an electrically non-conductive support channel, in which the flat-band connection is inserted in such a way that it supports at least one support shoulder, so that preferred with the two supportive shoulders, at the edges of the channel. As a consequence, the flat band joint can move in the longitudinal direction of the channel, although supported transversely to it, so that the counter element can be fed with a corresponding mutual assembly force for the electrical joint.

Preferably, it is provided that, after the mutual assembly of the flat band joint and the flat counter band joint is completed, a seal is performed, so that an optical control is not possible either. The sealing can be carried out, for example, by inserting into a housing, casting and / or extrusion with an electrically non-conductive material.

By means of the direct connection of the elements of connection of terminal of blade or of the counter-elements on an IMS or DBC substrate (Direct Bonded Copper) an electronic device of power with optimized constructive space and a very reduced thermal resistance can be created, with what the Electronic components and the junction that receives a high current load can absorb higher powers.

Brief description of the drawings.

The drawings illustrate the invention based on an exemplary embodiment and precisely show:

Figure 1 an electronic power circuit, which is provided with a flat band connection,

FIG. 2, in turn, an electronic power circuit, which also has a flat band connection, where, however, another connection element is shown in relation to FIG. 1,

Figure 3 a counter element, which can be coupled with the flat band joint of Figure 1 and

Fig. 4 a flat band joint, which is coupled with a flat counter band joint.

Figure 1 shows a substrate 1, which is configured as a printed circuit board 2. On the printed circuit board 2 is a power electronics, which has not been shown for simplicity. To the printed circuit board 2, that is to a contact surface 40 that is connected to the power electronics, an electrical junction 3 that supports a high current load is connected, where the connection point 4 can be configured as tin plating, welding and / or riveting joint. The connection point 4 is configured as a direct connection point 4, that is, the joint 3 is directly connected to said contact surface 40.

The connection 3 is configured as a flat band connection 5. It is composed of an electrically conductive metal strip 6, which essentially has a rectangular cross-section. The extreme region 7 is provided with a bend 8. A bend 9 is connected to the bend 8 which runs in a straight line, which becomes a flexion point 10. The flexion point 10 protrudes from the metal strip 6 laterally and has a approximately square cross section. As viewed from the wide side of the region 9, the flexion point 10 is configured as a U-shaped soul 11. In an exemplary embodiment, a meander-shaped element can also be provided instead of the U-shaped soul.

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After the flexion point 10 the metal strip 6 is transformed back into its rectangular flat band cross section and immersed in a support channel 12, which is configured in a support element 13 of electrically non-conductive material. The end region 7 is curved upwardly into the support channel 12 (flexion 4) and runs up to a blade terminal junction element 15, which is located outside the support channel 12. The blade terminal joint member 15 is configured in the region of a free end 16 of the flat band joint 5. There are two mutually facing shoulder straps 17 facing the flat band joint 5, which are integrally configured with the metal strip 6 and they rest on the channel edges of the support channel 12. The blade terminal 15 connecting element has an insertion slit 18, that is, at the ends the flat band joint 5 is configured as a fork with two arms of fork 19, 20.

In the exemplary embodiment of Figure 2, an identical configuration is presented in relation to Figure 1, so that reference is made to the above description. Only the fact that no insert slit 18 is available is different, but instead an insert core 21 is configured. The insert core 21 is attached at both ends to the remaining structure of the metal strip 6 , that is, one end of the insertion core 19 is integrally attached to the fork arm 19 and the other end to the fork arm 20.

Figure 3 shows a counter element 22, which can be electrically connected to the joint 3 that admits a high intensity load of Figure 1 by mutual plug in the course of the assembly process. In particular, an indissoluble mutual assembly of both pieces is carried out. In total, a blade terminal connection 37 is established. The counter-element 22 belongs, for example, to an electric consumer, especially an electric motor, where this electric consumer / motor must be electrically connected to the power electronic circuit 23 indicated in the figures. 1 and 2, that is, the power electronics on the substrate 1 feeds the corresponding electric consumer through the flat-band junction 5 and the counter-element 22.

According to FIG. 3, the counter-element 22 has an insertion core 24. The insertion core is disposed between a fork 27 of the counter-element 22 which has two arms 25 and 26, especially integral materialized on the counter-element 22. The two ends 28 and 29 of the insertion core 24 are integrally connected to the arms 25 and 26. Because the insertion core 24 bridges a recess 30 open at the edge, it limits a recess 31 and a through hole 32 The counter-element 22 has, for example, the layered path that can be deduced from Figure 3 with two curvatures 33 and 34 and is provided with a support core 35. The electric consumer is electrically connected to the counter-element 22, preferably directly, for example a electric motor, in such a way that a low impedance junction is established that supports a high current load.

The counter element 22 is configured - as is the flat band connection 5 - as a metal strip 6 ’, especially sheet metal stamping. The counter-element 22 represents a flat counter-band joint 36 for mutual assembly with the flat-band joint 5. For mutual assembly, the flat counter-band joint 36 with its insertion core 24 is pressed between the fork arms 19 and 20 of the flatband joint 5, such that the insertion core 24 enters the insertion slit 18, whereby an assembly process occurs and the joint is established that admits a high current load. It is especially provided that during the assembly process the assembly process admits a force path curve. During mutual assembly the pieces first make contact with each other. Here the insertion soul 24 is partially inserted in the insertion slit 18, where however the final position has not yet been adopted. By increasing force friction friction occurs, so that the assembly force is reduced. After this the assembly force increases again until the final seat. In this phase, a first blade terminal joint is established, with a clear peak of force. After its reduction, a correspondingly equal second junction is established, provided that a multipolar junction is needed to connect the consumer to the power electronics, this also with a clear peak of force. Here too, the force increases continuously until a seat is made. With the aforementioned force measurement, it can therefore be determined whether all the joints are located within the framework of the predetermined tolerance. If this is not the case, parts may be missing, the plug may be bent or some contacts may not be established. Alternatively, a press fit can also be assembled, which additionally must be visible during the measurement of admitted force, in order to have control. During the assembly process the flat band joint 5 is supported - as can be seen in Figure 1 - with its support shoulder 17 on the edge sides of the support channel 12, so that no harmful force is applied to the substrate 1, etc. Because of the support channel 12, it is possible in the longitudinal direction of the channel, with the deformation or widening of the flexion point 10, a modification of the orientation of the flat band joint 5.

In the exemplary embodiment of Figure 2 an insertion soul is provided. Accordingly, a corresponding counter-element 22 does not have an insertion core 24, but an insertion slit 18, as can be deduced from Figure 1 in the case of the flat band connection 5.

Figure 4 shows a flat band joint 5 with insert slit 18, wherein the flat band joint 5 is attached to the substrate 1, which presents the power electronics. The flat-band joint 5 is joined with a flat counter-band joint 36, where it has an insertion core 24, which is pressed into the insertion slit 18, such that a joint of blade edge 37. The flat counter-band joint 36 is directly connected to an electric consumer not shown in Figure 4.

Because of the invention, blade terminal joints can be realized in the course of assembly processes, which admit a high current load and, because of only a small number of interconnections (contacted 5 of different elements) can be configured with a very low impedance

It is especially provided that a blade terminal joint formed in accordance with the invention be configured mechanically decoupled after the assembly process. This can be done, for example, by the fact that high current junctions after the assembly process are no longer accessible, since they are used in enclosures to be closed. To facilitate the compression of the flat band joints 5 and the flat counter band joint 36, 10 a lubricant or a sliding coating can be applied to the blade terminal joint. The blade terminal junction is preferably inserted into a cavity, which is closed during the assembly process. In this way you get a lamella protection. The flat band joint 5 is configured as a result of the flexion point 10 as a mobile element, which is joined by means of assembly force to a fixed, stationary counter element, especially of the consumer. Alternatively, it can also proceed in such a way that the counter-band connection

15 flat 36 is mobile and the flat band joint 5 is fixedly arranged.

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Claims (10)

one.

Electronic power circuit that is arranged on a substrate and an electrical junction that admits a high current load, which is especially connected directly to the substrate at a connection point (4), where the junction (3) is configured as a junction flat band (3) and presents in the region of its free end a blade terminal joint element (15), characterized in that at least one support shoulder (17) is configured as support for a counter-bearing and a mutual assembly force is protected, during the attachment to a counter element (22), to avoid its application to the substrate.

2.

Electronic power circuit according to claim 1, characterized in that the flat band joint (5) is configured as a metal strip, especially sheet metal stamping.

3.

Electronic power circuit according to one of the preceding claims, characterized in that at least two mutually opposite support shoulders (17) are provided.

Four.

Electronic power circuit according to one of the preceding claims, characterized in that the especially direct connection of the joint (3) is configured as tin-plating, welding and / or riveting.

5.

Electronic power circuit according to one of the preceding claims, characterized in that the flat band joint (5) can be deformed in the direction of its longitudinal extension by means of the configuration of at least one flexion point (10), where the flexion point (10) is specially configured as a U-shaped soul (11)

or as a meander element.

6.

Electronic power circuit according to one of the preceding claims, characterized in that the blade terminal connection element (15) is configured as an insertion slit (18) for an insertion core (21, 24) of the counter element (22) or as insertion core (21, 24) for an insertion slit (18) of the counter element (22).

7.

Electronic power device with an electronic power circuit according to one or more of the preceding claims, characterized by a flat-band counter-joint (36) electrically joined by mutual assembly to the flat-band joint (5), wherein the joint of flat counter-band (36) presents or forms the counter-element (22), and is configured as a metal strip (6 '), especially as a stamped sheet metal part.

8.

Electronic power device according to one of the preceding claims, characterized by an electrically non-conductive support channel (12), on which the flat band joint (5) is supported with its at least one support shoulder (17).

9.

Electronic power device according to one of the preceding claims, characterized in that the flat band joint (5) assembled with the flat counterband joint (36) is encapsulated at least in the region of its junction point and / or embedded , cast or extruded in non-conductive material, especially synthetic material.

10.

Electronic power device according to one of the preceding claims, characterized in that the substrate is configured as a printed circuit board, especially as an IMS (Insulated Metal Substrate) or DBC (Direct Bonded Copper) substrate.